Abstract
In this article, the theory of equating the test is introduced and a procedure to write, analyze, and equate two mathematical tests of the multiple – choice questions are suggested. Statistical softwares (IATA and Excel) and Item Response Theory (IRT) were used in order to establish a common scale for two tests. These are the base to transfer the raw score as well as the latent trait or the ability score of testees from one test to another, in order to equate the difficulty between two tests and asssess exactly the ability of testees. Using the above theory, this study has experimented two one-period tests for one chapter of grade 12 mathematical curriculum for students in Bac Lieu, Soc Trang, and Kien Giang provinces in 2019.
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